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Add histogram bin errors as sqrt(sum (weights of 1)^2) [no other weights available]

Markus Frank requested to merge histogram_errors into master

Add histogram bin errors as sqrt(sum (weights of 1)^2) [no other weights available] Gaudi histograms apparently do not provide sum(weights^2). We use instead as an approximation sum(weights^2) = sum(weights) as bin-errors, which corresponds to the fill weights of 1.

Edited by Markus Frank

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